U.S. patent number 8,945,284 [Application Number 13/488,738] was granted by the patent office on 2015-02-03 for deoiler seal.
This patent grant is currently assigned to Hamilton Sundstrand Corporation. The grantee listed for this patent is Michael R. Blewett, Keith E. Short. Invention is credited to Michael R. Blewett, Keith E. Short.
United States Patent |
8,945,284 |
Short , et al. |
February 3, 2015 |
Deoiler seal
Abstract
An assembly includes a housing having a housing cavity, an
inlet, and an outlet, a rotatable shaft positioned proximate the
outlet, and a seal positioned at an interface of the rotatable
shaft and the housing. The seal includes porous material adjacent
the shaft and the housing and a shell substantially separating the
porous material from the housing cavity. The shell includes an
inlet that allows fluid flow from the housing cavity to the porous
material and an outlet that allows fluid flow from the porous
material to the housing interior. The inlet is positioned radially
inward of the outlet.
Inventors: |
Short; Keith E. (Rockford,
IL), Blewett; Michael R. (Stillman Valley, IL) |
Applicant: |
Name |
City |
State |
Country |
Type |
Short; Keith E.
Blewett; Michael R. |
Rockford
Stillman Valley |
IL
IL |
US
US |
|
|
Assignee: |
Hamilton Sundstrand Corporation
(Windsor Locks, CT)
|
Family
ID: |
48607024 |
Appl.
No.: |
13/488,738 |
Filed: |
June 5, 2012 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20130319240 A1 |
Dec 5, 2013 |
|
Current U.S.
Class: |
95/270; 55/385.1;
55/418; 55/317; 55/DIG.30; 96/190; 96/188; 55/400; 55/385.3;
55/409; 96/189; 55/408; 55/DIG.19 |
Current CPC
Class: |
F01D
25/183 (20130101); F02C 7/28 (20130101); F05D
2240/55 (20130101); F02C 7/32 (20130101); F05D
2300/514 (20130101); F05D 2260/609 (20130101) |
Current International
Class: |
B01D
45/12 (20060101) |
Field of
Search: |
;55/317,418,385.1,358.3,400,404-409,DIG.19,DIG.30 ;96/188,189,190
;95/270 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Bui; Dung H
Attorney, Agent or Firm: Kinney & Lange, P.A.
Claims
The invention claimed is:
1. An assembly comprising: a housing having a housing cavity, an
inlet, and an outlet; a rotatable shaft positioned proximate the
outlet; a seal positioned at an interface of the rotatable shaft
and the housing, wherein the seal comprises: porous material
adjacent the shaft and the housing; and a shell substantially
separating the porous material from the housing cavity, the shell
comprising: an inlet that allows fluid flow from the housing cavity
to the porous material; and an outlet that allows fluid flow from
the porous material to the housing cavity, wherein the inlet is
positioned radially inward of the outlet.
2. The assembly of claim 1, wherein the housing is a gearbox
housing, and wherein the rotatable shaft is a deoiler shaft of a
deoiler.
3. The assembly of claim 2, wherein the deoiler further comprises:
a separator mounted on the shaft so as to rotate with the shaft and
having separating media positioned inside a separator case.
4. The assembly of claim 3, wherein the separating media and the
porous material are substantially similar materials.
5. The assembly of claim 1, wherein the porous material is a metal
foam.
6. The assembly of claim 1, wherein the porous material is
substantially annular, having a first portion substantially axially
aligned with respect to a centerline axis of the shaft and a second
portion substantially radially aligned with respect to the
centerline axis.
7. The assembly of claim 1, wherein the shell is substantially
annular, having a radially inner edge abutting the shaft.
8. The assembly of claim 7, wherein the shell further comprises: a
first radial surface extending substantially radially outward from
the radially inner edge with respect to a centerline axis of the
shaft, wherein the inlet is one of a plurality of holes extending
through the first radial surface.
9. The assembly of claim 8, wherein the shell further comprises: a
second radial surface extending substantially radially inward from
a radially outer edge of the shell; and an axial surface extending
substantially axially from the first radial surface to the second
radial surface.
10. The assembly of claim 1, and further comprising: a first
labyrinth seal positioned between the shaft and the outlet of the
housing.
11. The assembly of claim 10, and further comprising: a second
labyrinth seal integrally formed with the housing and positioned
adjacent but spaced from the porous material.
12. The assembly of claim 1, wherein the porous material
substantially fills the shell.
13. A method for operating an assembly, the method comprising:
rotating a shaft about a centerline axis, wherein the shaft is
positioned proximate an outlet of a gearbox housing; sealing an
interface between the shaft and the gearbox housing via a seal
mounted on the shaft, wherein the seal comprises porous material
adjacent the shaft and the gearbox housing, the seal comprises a
shell substantially separating the porous material from a housing
cavity of the gearbox housing, and the shell comprises an inlet
that allows fluid flow from the housing cavity to the porous
material and an outlet that allows fluid flow from the porous
material to the housing cavity, wherein the inlet is positioned
radially inward of the outlet; flowing an air-oil mist through the
shell inlet; separating oil from the air-oil mist within the seal;
and flowing the oil out of the seal through the shell outlet
positioned radially outward of the shell inlet.
14. The method of claim 13, and further comprising: rotating a
deoiler separator mounted on the shaft; flowing an air-oil mist
through an inlet of a deoiler separator; separating oil from the
air-oil mist within the deoiler separator; flowing oil out of the
deoiler separator through a separator oil outlet into the housing
cavity of the gearbox housing; and flowing air out of the deoiler
separator through a separator gas outlet to an exterior of the
gearbox housing.
15. The method of claim 14, wherein oil is separated from the
air-oil mist within the seal via a first porous material and
wherein oil is separated from the air-oil mist within the deoiler
separator via a second porous material.
16. The method of claim 13, wherein the seal is positioned
proximate but spaced from the gearbox housing.
17. The method of claim 13, and further comprising: limiting flow
between the seal and the gearbox housing via a labyrinth seal.
18. The method of claim 13, wherein flowing the air-oil mist
through the shell inlet comprises flowing the air-oil mist into the
porous material.
19. The method of claim 18, wherein separating oil from the air-oil
mist within the seal is performed via the porous material.
20. The method of claim 13, and further comprising: flowing
substantially deoiled air from the seal through the outlet of the
gearbox housing.
Description
BACKGROUND
The present invention relates to gas turbine engines, and in
particular to a deoiler for a lubrication system of a gas turbine
engine.
Gas turbine engines typically include lubrication systems for
providing lubricating liquid, such as oil, to various components of
the gas turbine engine such as gears and bearings. Lubrication
systems typically supply the oil to the components to cool and
lubricate the components and then scavenge used oil from the
components, to be cooled, filtered, and supplied again to those
components. When the lubricating liquid is scavenged from those
components, the lubrication system can scavenge a mixture of oil
and air. Particle laden air can be supplied to a deoiler to
separate the oil from the air.
In some lubrication systems, a rotating deoiler is positioned in a
housing and includes a rotating shaft that interfaces with an
outlet of the housing. If the housing is pressurized, oil laden air
can undesirably escape between the rotating shaft and the housing.
It can be difficult and expensive to adequately seal the interface
between the rotating shaft and the housing. Moreover, seals can be
wear-prone and can be expensive and time-consuming to replace.
Bleed air can be provided to back-pressure the seal to reduce the
amount of escaping oil; however providing this air can undesirably
reduce engine efficiency.
SUMMARY
According to one embodiment of the present invention, an assembly
includes a housing having a housing cavity, an inlet, and an
outlet, a rotatable shaft positioned proximate the outlet, and a
seal positioned at an interface of the rotatable shaft and the
housing. The seal includes porous material adjacent the shaft and
the housing and a shell substantially separating the porous
material from the housing cavity. The shell includes an inlet that
allows fluid flow from the housing cavity to the porous material
and an outlet that allows fluid flow from the porous material to
the housing interior. The inlet is positioned radially inward of
the outlet.
Another embodiment of the present invention is a method for
operating an assembly having a shaft is positioned proximate an
outlet of a gearbox housing. The method includes rotating the shaft
about a centerline axis, sealing an interface between the shaft and
the gearbox housing via a seal mounted on the shaft, flowing an
air-oil mist through a seal inlet, separating oil from the air-oil
mist within the seal, and flowing the oil out of the seal through a
seal outlet positioned radially outward of the seal inlet.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side schematic view of a gas turbine engine.
FIG. 2 is a side schematic view a gearbox and deoiler for use in
the gas turbine engine of FIG. 1.
FIG. 3 is a partial perspective sectional view of the gearbox and
deoiler of FIG. 2.
DETAILED DESCRIPTION
FIG. 1 is a side schematic view of gas turbine engine 10. Gas
turbine engine 10 includes propulsion fan 12, compressor section
14, combustor section 16, and turbine section 18. Low pressure
spool 20 (which includes fan 12, low pressure compressor 22, and
low pressure turbine 24 connected by low pressure shaft 26) and
high pressure spool 28 (which includes high pressure compressor 30
and high pressure turbine 32 connected by high pressure shaft 34)
each extend from compressor section 14 to turbine section 18. Low
pressure shaft 26 is supported by bearing compartments 36, 38, and
40 which include bearings (not shown). High pressure shaft 34 is
supported by bearing compartments 36 and 38. Bearing compartments
36, 38, and 40 allow low pressure shaft 26 and high pressure shaft
34 to rotate at relatively high speeds about engine centerline axis
C.sub.L-E. Gas turbine engine 10 further includes deoiler 42
positioned in gearbox 44. Gearbox 44 can include gearing (not
shown) which is connected to one of low pressure spool 20 or high
pressure spool 28 for driving various engine accessories mounted to
gearbox 44, such as deoiler 42, generator 46, and oil pumps 48.
When gas turbine engine 10 is operated, gas flows from main
compressor section 14 to main turbine section 18 along main flow
path 50. Gas is compressed in compressor section 14 and then
delivered to combustor section 16 where fuel is added and
combusted. Gas from combustor section 16 is delivered to turbine
section 18, where it drives low pressure turbine 24 and high
pressure turbine 32 to rotate low pressure spool 20 and high
pressure spool 28, respectively.
Oil pumps 48 can supply a lubricating liquid, such as oil, to
various components in gas turbine engine 10, such as gearbox 44 and
bearing compartments 36, 38, and 40. Gas flowing along main flow
path 50 can be relatively high pressure, which can cause that gas
to leak into bearing compartments 36, 38, and 40. Gas in bearing
compartments 36, 38, and 40 can be vented along vent passage 52 to
deoiler 42. The gas in bearing compartments 36, 38, and 40 can
include oil particles when vented to deoiler 42 as an air-oil mist.
Deoiler 42 can separate the oil particles from the gas, delivering
the separated oil to gearbox 44 and venting the separated gas out
of gearbox 44 along flow arrow 54.
FIG. 2 is a side schematic view of gearbox 44 and deoiler 42.
Gearbox 44 includes gearbox housing 56 defining housing cavity 58.
Gearbox inlet 60 allows flow from vent passage 52 (shown in FIG. 1)
into gearbox housing 56 and gearbox outlet 62 allows flow of gas
from deoiler 42 out of gearbox housing 56. Deoiler 42 includes gear
64, separator 66, and deoiler seal 68 mounted on deoiler shaft 70.
In the illustrated embodiment, deoiler shaft 70 has first end 72
and second end 74. First end 72 is positioned in housing cavity 58
and second end 74 is positioned proximate gearbox outlet 62 of
gearbox housing 56. In the illustrated embodiment, second end 74 is
positioned slightly exterior of gearbox housing 56. In alternative
embodiments, second end 74 can extend further outside of gearbox
housing 56, or can be positioned slightly interior of gearbox
housing 56. Deoiler shaft 70 has solid shaft portion 76 near first
end 72 and hollow shaft portion 78 near second end 74. Deoiler
shaft 70 is supported by deoiler bearings 80 and 82. Deoiler
bearings 80 and 82 can be ball bearings or another type of bearing
suitable for supporting deoiler shaft 70. Deoiler bearing 80 is
mounted on solid shaft portion 76 at first end 72. Deoiler bearing
82 is mounted on hollow shaft portion 78 near a middle of deoiler
shaft 70. In an alternative embodiment, deoiler bearing 82 can be
mounted nearer second end 74.
Gear 64 is mounted to solid shaft portion 76 between bearings 80
and 82, and is driven by gearing (not shown) to rotate deoiler
shaft 70. Deoiler seal 68 is mounted on hollow shaft portion 78
near second end 74, proximate gearbox outlet 62 at an interface
between deoiler shaft 70 and gearbox outlet 62. Deoiler seal 68
provides a seal between deoiler shaft 70 and gearbox housing 56 at
gearbox outlet 62, to allow rotation of deoiler shaft 70 about
deoiler centerline axis C.sub.L-D while limiting flow of oil
through gearbox outlet 62.
Separator 66 is mounted on hollow shaft portion 78, between deoiler
bearing 82 and deoiler seal 68. Separator 66 includes separator
case 84 and separating media 86 positioned inside separator case
84. Separator case 84 includes separator inlet 88, separator gas
outlet 90, and separator oil outlet 92. Separating media 86 can be
a porous material, such as a metal foam.
When deoiler 42 is operated, gas and oil flow into gearbox 44 as an
air-oil mist through gearbox inlet 60 along flow arrow 92. Housing
cavity 58 is pressurized, which pushes the air-oil mist through
separator inlet 88 along flow arrow 94 into separating media 86.
Oil from the air-oil mist can collect on separating media 86 as the
air-oil mist flows through separating media 86. As separator 66 is
rotated about deoiler centerline axis C.sub.L-D, the relatively
heavy oil is spun radially outward due to centrifugal force and
eventually flows out of separator oil outlet 92 at a radially
outward perimeter of separator case 84 along flow arrow 96. At the
same time, the relatively light gas (primarily air) flows radially
inward through separator gas outlet 90 into hollow shaft portion 78
along flow arrow 98. The gas then flows along flow arrow 54 through
gearbox outlet 62, out of deoiler 42 and out of gearbox 44. Thus,
deoiler 42 can substantially reduce the amount of oil suspended in
the gas flowing through gearbox outlet 62 along flow arrow 54.
FIG. 3 is a partial perspective sectional view of gearbox 44,
deoiler 42, and deoiler seal 68. Deoiler seal 68 is positioned on
and in contact with deoiler shaft 70, and is spaced from gearbox
housing 56 by gap 100. Deoiler seal 68 includes separating media
102 and shell 104.
In the illustrated embodiment, separating media 102 is a porous
material having pores 106. Separating media 102 can be metal foam
made of, for example, aluminum, nickel alloy, or copper. In an
alternative embodiment, separating medial 102 can be a ceramic
foam. In further alternative embodiments, separating media 102 can
be another media having pores or channels suitable for
centrifugally pumping oil droplets radially outward, as described
further below. In one embodiment, separating media 102 and
separating media 86 (shown in FIG. 2) can be substantially similar
materials. In other embodiments, separating media 102 and
separating media 86 can be different materials. Separating media
102 is substantially annular, having axial separating portion 108
(which is substantially axially aligned with respect to deoiler
centerline axis C.sub.L-D shown in FIG. 2) and radial separating
portion 110 (which is substantially radially aligned with respect
to deoiler centerline axis C.sub.L-D). Separating media 102 is
adjacent and in contact with deoiler shaft 70. Separating media 102
is adjacent and spaced from gearbox housing 56 by gap 100.
Shell 104 is a substantially solid material adjacent separating
media 102. Shell 104 can be made of aluminum, steel, or another
substantially solid material suitable for the application. Shell
104 substantially separates separating media 102 from housing
cavity 58. Separating media 102 substantially fills shell 104.
Shell 104 is substantially annular, with radially inner edge 112
adjacent and abutting deoiler shaft 70, and radially outer edge 114
spaced radially outward of radially inner edge 112. Shell 104 has
first radial surface 116 extending substantially radially outward
from radially inner edge 112, second radial surface 118 extending
substantially radially inward from radially outer edge 114, and
axial surface 120 extending substantially axially from first radial
surface 116 to second radial surface 118.
Shell 104 has seal inlets 122 and seal outlet 124. Shell 104 can
substantially seal separating medial 102 from housing cavity 58
except at seal inlets 122 and seal outlet 124. Seal outlet 124 is
spaced radially outward of seal inlets 122. In the illustrated
embodiment, seal inlets 122 are a plurality of holes extending
through first radial surface 116 of shell 104. Seal outlet 124 is
defined by a gap between radially outer edge 114 of shell 104 and
ridge 126. Ridge 126 is a substantially annular ridge extending
from gearbox housing 56. In alternative embodiments, seal inlet 122
and seal outlet 124 can be one or more holes, slots, or gaps shaped
and positioned differently than as illustrated. For example, seal
outlet 124 can be a plurality of discrete holes extending through
shell 104, similar to seal inlets 122. Seal inlets 122 allow fluid
flow from housing cavity 58 to separating material 102. Seal outlet
124 allows fluid flow from separating material 102 to housing
cavity 58.
Ring 130 is positioned adjacent separating media 102 for holding
deoiler seal 68 in place on deoiler shaft 70. Labyrinth seal 132 is
positioned adjacent but spaced from separating media 102 to limit
flow between gearbox housing 56 and separating media 102. In the
illustrated embodiment, labyrinth seal 132 is integrally formed
with gearbox housing 56. Labyrinth seal 134 is positioned adjacent
but spaced from deoiler shaft 70 to limit flow between gearbox
housing 56 and deoiler shaft 56. In one embodiment, labyrinth seal
134 can be made out of aluminum. Because gearbox housing 56 is
spaced from both deoiler shaft 70 and deoiler seal 68, a limited
amount of gas can flow past deoiler seal 68 and though gearbox
outlet 62. Deoiler seal 68 can function to reduce an amount of oil
suspended in the gas flowing past deoiler seal 68 and through
gearbox outlet 62.
In operation, as deoiler shaft 70 rotates, deoiler seal 68 also
rotates. Gas and oil in the form of an air-oil mist can flow
through seal inlets 122 into separating media 102. Much like
separating media 86 in separator 66, oil from the air-oil mist can
collect on separating media 102 as the air-oil mist flows through
separating media 102. The separated oil can then be slung radially
outward along radial separating portion 110 and out seal outlet
124, and flow back to housing cavity 58. Substantially deoiled air
can flow through space between labyrinth seal 134 and deoiler shaft
70, and thus flow through gearbox outlet 62 to an exterior of
gearbox housing 56. Deoiler 68 acts as a centrifugal impeller to
pump oil droplets radially outward through seal outlet 124. Thus,
deoiler seal 68 can function as a seal and also function as a
second separator for separating oil from gas. Though the separated
gas flowing through space between labyrinth seal 134 and deoiler
shaft 70 can still include a substantially reduced quantity of oil
particles, gas turbine engine 10 (shown in FIG. 1) can tolerate a
limited quantity of oil flowing out gearbox outlet 62 so long as
the quantity of oil is below a threshold.
Various embodiments of deoiler seal 68 can provide a relatively
cost effective method of sealing an interface between a rotating
shaft and a housing, such as deoiler shaft 70 and gearbox housing
56. Deoiler seal 68 can limit flow of oil out gearbox outlet 62
without requiring assistance from a flow of back-pressure air.
Because deoiler seal 68 provides a relatively effective seal
without contacting gearbox housing 56, deoiler seal 68 can be
relatively low-maintenance, capable of lasting the entire lifetime
of gas turbine engine 10 without being replaced. This can be
particularly beneficial in applications where bearings 80 and 82
allow deoiler shaft 70 to wobble about deoiler centerline axis
C.sub.L-D at second end 74. Thus, various embodiments of deoiler
seal 68 can substantially reduce the cost of operating and
maintaining deoiler 42.
While the invention has been described with reference to a
exemplary embodiments, it will be understood by those skilled in
the art that various changes may be made and equivalents may be
substituted for elements thereof without departing from the scope
of the invention. In addition, many modifications may be made to
adapt a particular situation or material to the teachings of the
invention without departing from the essential scope thereof.
Therefore, it is intended that the invention not be limited to the
particular embodiments disclosed, but that the invention will
include all embodiments falling within the scope of the appended
claims. For example, deoiler seal 68 can be used to seal an
interface of a shaft other than deoiler shaft 70, such as another
shaft (not shown) in gearbox 44.
* * * * *